Enhancement of the electrical performance of poly(vinyl) alcohol by doping with chlorophyll and gamma irradiation

Radwan, R.M.; Lotfy, Salah; Desouky, Omar S.

doi:10.1016/j.nimb.2008.07.009

Cited by 9 publications

(4 citation statements)

References 23 publications

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“…In the same situation Figure 1d shows the impedance decreased with the increase in radiation to 5 kGy, as it was observed that it decreased to 540 for pure epoxy and to 410 kΩ for highest concentration. The increase in the gamma irradiation dosage may increase the number of free radicals that react to decrease the impedance of the tested samples [9,16,19]. Figure 2a-d shows the dielectric constant frequency dependence of epoxy filled with different nano-silica concentrations composites at room temperature before and after gamma radiation.…”

Section: Resultsmentioning

confidence: 99%

Effects of Gamma Radiation Doses on the AC Electrical Properties of Epoxy Reinforced with Nano-Silica Composites

abusaleh

Elimat

Alzubi³

et al. 2023

J. Compos. Sci.

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This study reports the effects of gamma radiation on the AC electrical properties of epoxy nano-silica composite sheets with an average thickness of 3 mm. Epoxy reinforced with different nano-silica concentrations of 0, 5, 10, and 15 wt.%. The epoxy nano-silica composites were exposed to different gamma radiation dosages of 1, 3, and 5 kGy. The data were analyzed before and after gamma irradiation and the results showed that the AC electrical properties of the gamma-irradiated epoxy nano-silica composites varied from those of the non-irradiated samples. We found that there were significant changes in the impedance, dielectric constant, dielectric loss, and AC electrical conductivity values of the epoxy nano-silica composites after irradiation, and the AC electrical conductivity and dielectric constant values of the nano-silica composites were enhanced by exposing the samples to gamma radiation because more free electrons were released inside the epoxy nano-silica composites. The AC electrical properties, such as impedance, dielectric constant, dielectric loss, and electrical conductivity, of the epoxy nano-silica composites were studied and discussed before and after gamma radiation with different dosages. We found that these AC electrical properties marginally increased with increasing doses of gamma irradiation.

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Section: Resultsmentioning

confidence: 99%

Effects of Gamma Radiation Doses on the AC Electrical Properties of Epoxy Reinforced with Nano-Silica Composites

abusaleh

Elimat

Alzubi³

et al. 2023

J. Compos. Sci.

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“…[11] This chain scission leads to a reduction in the average molecular weight of the PET, which, in turn, increases molecular mobility. For a charging time of 1000s, for example, the current value for the un-irradiated sample of 6.5 Â 10 À12 A is shown to increase up to 6.3 Â 10 À11 A for the 150 Â 10 3 Gy irradiated sample.…”

Section: Resultsmentioning

confidence: 99%

Influence of Gamma Radiation on Electrical Conduction of Polyethylene Terephthalate (PET) at Ambient Temperature

Belkahla

Saidi-Amroun

Saïdi

et al. 2013

International Journal of Polymer Analysis and Characterization

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The electrical conduction in polyethylene terephthalate (PET) exposed to a gamma radiation dose of 150 kGy was investigated in the applied field range from 4 to 36 kV=mm. Samples were irradiated in air at room temperature by means of a 60 Co gamma source at a dose rate of approximately 42 Gy=min. The electrical properties of virgin and irradiated materials were examined by charging and discharging current measurements. The current decays with time can be represented according to an inverse power law. The changes of dielectric behavior after irradiation were attributed to scission effects.

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“…6. Variation of dielectric loss for PVA films as a function of gamma irradiation dose at a higher frequency range from 1 KHz to 1 MHz [105] Radwan et al [105] identified that gamma radiation with a dose 250 kGy increased the dc conductivity of PVA doped with chlorophyll to about fifteen times. Nizam et al [106] concluded that the exposure of PVA blended with polyacrylamide to gamma radiation led to the occurrence of cross linking upon exposure to a dose of 100 kGy.…”

Section: Interaction Of Shi With Conducting Polymers and Polymer Elec...mentioning

confidence: 99%

Conductivity Modulation in Polymer Electrolytes and their Composites due to Ion-Beam Irradiation

Singh

Bhattacharya

Virk

2015

SSP

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Polymers are a class of materials widely used in different fields of applications. With imminent applications of polymers, the study of radiation induced changes in polymers has become an obvious scientific demand. The bombardment by ion beam radiations has become one of the most promising techniques in present day polymer research. When the polymers are irradiated, a variety of physical and chemical changes takes place due to energy deposition of the radiation in the polymer matrix. Scissoring, cross-linking, recombination, radical decomposition, etc. are some of the interesting changes that are obvious in polymers. The modification in polymer properties by irradiation depends mainly on the nature of radiation and the type of polymer used.Polymer electrolytes are obtained by modifying polymers by doping, complexing, or other chemical processes. In general, they suffer from low conductivity due to high crystallinity of the matrix. The effect of radiation on polymer electrolyte is expected to alter their crystalline nature vis-a-vis electrical properties. This review article shall elaborate modifications in the physical and chemical properties of polymer electrolytes and their composites. The variations in properties have been explored on PEO based polymer electrolyte and correlated with the parameters responsible for such changes. Also a comparison with different types of the polymers irradiated with a wide range of ion beams has been established.

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Enhancement of the electrical performance of poly(vinyl) alcohol by doping with chlorophyll and gamma irradiation

Cited by 9 publications

References 23 publications

Effects of Gamma Radiation Doses on the AC Electrical Properties of Epoxy Reinforced with Nano-Silica Composites

Effects of Gamma Radiation Doses on the AC Electrical Properties of Epoxy Reinforced with Nano-Silica Composites

Influence of Gamma Radiation on Electrical Conduction of Polyethylene Terephthalate (PET) at Ambient Temperature

Conductivity Modulation in Polymer Electrolytes and their Composites due to Ion-Beam Irradiation

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